Cause:Microsoft Update 2661254 (http://www.microsoft.com/en-us/download/details.aspx?id=30487) is an update for minimum certificate key length. The description of this update states, “This advisory announces that the use of RSA certificates that have keys that are less than 1024 bits long will be blocked.”

Solution:Updating your Novell GroupWise Data Synchronizer server with a certificate that is 1024 bits or larger in length will resolve this issue.

For more information, see the following links from Novell and from Microsoft: